Tubular pile composite foundation suitable for high-fill collapsible loess site and construction method thereof
A technology of collapsible loess and composite foundations, which is applied in infrastructure engineering, sheet pile walls, buildings, etc. to save materials, flexibly arrange, and improve vertical bearing capacity.
Active Publication Date: 2021-11-23
YANAN UNIV
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[0004]
The purpose of the present invention is to provide a pipe pile composite foundation suitable for high-fill collapsible loess sites, to improve and solve the problems of high-fill loess foundation bearing capacity and deformation resistance, and to improve the safety of buildings in high-fill loess sites
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[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered by the claims.
[0035] See Figure 1 to Figure 6 , this embodiment provides a pipe pile composite foundation suitable for high fill collapsible loess sites, including a plurality of umbrella-shaped bottom-expanding pipe pile assemblies, a reinforced mattress layer 6 and a loess base layer 7; specifically: A plurality of umbrella-shaped bottom-expanding pipe pile assemblies are arranged in the loess base, and a reinforced mattress layer is applied on them to form a composite foundation.
[0036] Each umbrella-shaped bottom-expanding pipe pile assembly includes a pipe pile 1 , an umbrella-shaped bottom-expanding structure 2 , a grouting pipe 4 and a grouting body 5 . The pipe piles are preferably prefabricated with reinforced concrete or section steel materials. Taking ste...
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The invention discloses a tubular pile composite foundation suitable for a high-fill collapsible loess site and a construction method thereof. The tubular pile composite foundation comprises a plurality of umbrella-shaped bottom-expanding tubular pile assemblies, a reinforced mattress layer and a loess foundation layer, wherein each umbrella-shaped bottom-expanding tubular pile assembly comprises a tubular pile, an umbrella-shaped bottom-expanding structure, a grouting pipe and a grouting body; and each umbrella-shaped bottom-expanding structure comprises a connecting sleeve, a fixed ring, a central steel pipe, an outer-expanding steel pipe, a three-way joint, a first supporting rod, a fixed joint and a grouting joint. According to the tubular pile composite foundation disclosed by the invention, the umbrella-shaped bottom-expanding structures can be expanded by a certain angle under the action of vertical pressure, and the umbrella-shaped bottom-expanding structures are wrapped by high-pressure grouting cement slurry to form an expanded cement soil pile bottom reinforcing structure; the umbrella-shaped bottom-expanding structures are connected with the tubular piles to form a combined pile structure, so that vertical bearing capacity of pile bodies is improved, and therefore, vertical bearing performance of the umbrella-shaped bottom-expanding tubular pile composite foundation is strengthened; and the tubular pile composite foundation can be suitable for high-fill collapsible loess foundation treatment, and has relatively good sinking resistance, differential settlement resistance and deformation coordination capacity.
Description
technical field [0001] The invention relates to the technical field of high-fill loess engineering foundation treatment, in particular to a pipe pile composite foundation suitable for high-fill collapsible loess sites and a construction method thereof. Background technique [0002] The main problem of high-fill loess site engineering is the uneven deformation caused by post-consolidation settlement of the loess foundation, humidification and subsidence, etc., resulting in disasters such as foundation instability, cracking of the building structure, and large deformation, which seriously affect the service safety of the engineering structure. [0003] In the prior art, the invention patent with publication number CN101649613A discloses a prestressed pipe pile with an enlarged head and its construction method. The pipe pile includes: a pipe pile body and an enlarged head, wherein one end of the pipe pile body is connected to the enlarged head. Connection and expansion The head...
Claims
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IPC IPC(8): E02D5/44E02D5/62E02D5/22E02D5/66E02D27/12E02D27/34E02D15/04
CPCE02D5/44E02D5/62E02D5/223E02D5/665E02D27/12E02D27/34E02D15/04
Inventor 邱明明黄加昊王弘起孙杰龙杨红霞李盛斌
Owner YANAN UNIV